... 2.Long service life 3.low noise 4.Low friction Deep Groove Ball BearingWe have open Z,ZZ,RS,2RS,RZ ... into Z1V1,Z2V2,Z3V3We produce 6000,6200,6300,6800,6900 series.ApplicationThose bearings are widely used in home appliances,electric tools ... ,fitness equipment,motors,motorbikes,bicycles,cars and other areas Deep Groove Ball Bearing